use crate::*;

def_sizes_iter!(ScenesSizes => Scene);

impl<T: Has<Vec<Scene>> + Send + Sync> HasScenes for T {}

pub trait HasScenes: Has<Vec<Scene>> + Send + Sync {
    fn scenes (&self) -> &Vec<Scene> {
        Has::<Vec<Scene>>::get(self)
    }
    fn scenes_mut (&mut self) -> &mut Vec<Scene> {
        Has::<Vec<Scene>>::get_mut(self)
    }
    /// Generate the default name for a new scene
    fn scene_default_name (&self) -> Arc<str> {
        format!("s{:3>}", self.scenes().len() + 1).into()
    }
    fn scene_longest_name (&self) -> usize {
        self.scenes().iter().map(|s|s.name.len()).fold(0, usize::max)
    }
}

pub trait HasSceneScroll: HasScenes {
    fn scene_scroll (&self) -> usize;
}
impl HasSceneScroll for Arrangement {
    fn scene_scroll (&self) -> usize { self.scene_scroll }
}

pub type SceneWith<'a, T> = (usize, &'a Scene, usize, usize, T);

impl<T: HasScenes + HasTracks> AddScene for T {}

pub trait AddScene: HasScenes + HasTracks {
    /// Add multiple scenes
    fn scenes_add (&mut self, n: usize) -> Usually<()> {
        let scene_color_1 = ItemColor::random();
        let scene_color_2 = ItemColor::random();
        for i in 0..n {
            let _ = self.scene_add(None, Some(
                scene_color_1.mix(scene_color_2, i as f32 / n as f32).into()
            ))?;
        }
        Ok(())
    }
    /// Add a scene
    fn scene_add (&mut self, name: Option<&str>, color: Option<ItemTheme>)
        -> Usually<(usize, &mut Scene)>
    {
        let scene = Scene {
            name:  name.map_or_else(||self.scene_default_name(), |x|x.to_string().into()),
            clips: vec![None;self.tracks().len()],
            color: color.unwrap_or_else(ItemTheme::random),
        };
        self.scenes_mut().push(scene);
        let index = self.scenes().len() - 1;
        Ok((index, &mut self.scenes_mut()[index]))
    }
}

impl Scene {
    fn _todo_opt_bool_stub_ (&self) -> Option<bool> { todo!() }
    fn _todo_usize_stub_ (&self) -> usize { todo!() }
    fn _todo_arc_str_stub_ (&self) -> Arc<str> { todo!() }
    fn _todo_item_theme_stub (&self) -> ItemTheme { todo!() }
}

def_command!(SceneCommand: |scene: Scene| {
    SetSize { size: usize } => { todo!() },
    SetZoom { size: usize } => { todo!() },
    SetName  { name:  Arc<str>  } =>
        swap_value(&mut scene.name, name, |name|Self::SetName{name}),
    SetColor { color: ItemTheme } =>
        swap_value(&mut scene.color, color, |color|Self::SetColor{color}),
});

impl<T: Has<Option<Scene>> + Send + Sync> HasScene for T {}

pub trait HasScene: Has<Option<Scene>> + Send + Sync {
    fn scene (&self) -> Option<&Scene> {
        Has::<Option<Scene>>::get(self).as_ref()
    }
    fn scene_mut (&mut self) -> &mut Option<Scene> {
        Has::<Option<Scene>>::get_mut(self)
    }
}

pub trait ScenesView:
    HasEditor +
    HasSelection +
    HasSceneScroll +
    HasClipsSize +
    Send +
    Sync
{
    /// Default scene height.
    const H_SCENE:  usize = 2;
    /// Default editor height.
    const H_EDITOR: usize = 15;
    fn h_scenes (&self) -> u16;
    fn w_side   (&self) -> u16;
    fn w_mid    (&self) -> u16;
    fn scenes_with_sizes (&self) -> impl ScenesSizes<'_> {
        let mut y = 0;
        self.scenes().iter().enumerate().skip(self.scene_scroll()).map_while(move|(s, scene)|{
            let height = if self.selection().scene() == Some(s) && self.editor().is_some() {
                8
            } else {
                Self::H_SCENE
            };
            if y + height <= self.clips_size().h() {
                let data = (s, scene, y, y + height);
                y += height;
                Some(data)
            } else {
                None
            }
        })
    }
    fn view_scenes_names (&self) -> impl Content<TuiOut> {
        Fixed::x(20, Thunk::new(|to: &mut TuiOut|for (index, scene, ..) in self.scenes_with_sizes() {
            to.place(&self.view_scene_name(index, scene));
        }))
    }
    fn view_scene_name <'a> (&'a self, index: usize, scene: &'a Scene) -> impl Content<TuiOut> + 'a {
        let h = if self.selection().scene() == Some(index) && let Some(_editor) = self.editor() {
            7
        } else {
            Self::H_SCENE as u16
        };
        let bg = if self.selection().scene() == Some(index) {
            scene.color.light.rgb
        } else {
            scene.color.base.rgb
        };
        let a = Fill::X(Align::w(Bsp::e(format!("·s{index:02} "),
            Tui::fg(Tui::g(255), Tui::bold(true, &scene.name)))));
        let b = When::new(self.selection().scene() == Some(index) && self.is_editing(),
            Fill::XY(Align::nw(Bsp::s(
                self.editor().as_ref().map(|e|e.clip_status()),
                self.editor().as_ref().map(|e|e.edit_status())))));
        Fixed::XY(20, h, Tui::bg(bg, Align::nw(Bsp::s(a, b))))
    }
}

#[derive(Debug, Default)]
pub struct Scene {
    /// Name of scene
    pub name:  Arc<str>,
    /// Identifying color of scene
    pub color: ItemTheme,
    /// Clips in scene, one per track
    pub clips: Vec<Option<Arc<RwLock<MidiClip>>>>,
}

impl Scene {
    /// Returns the pulse length of the longest clip in the scene
    pub fn pulses (&self) -> usize {
        self.clips.iter().fold(0, |a, p|{
            a.max(p.as_ref().map(|q|q.read().unwrap().length).unwrap_or(0))
        })
    }
    /// Returns true if all clips in the scene are
    /// currently playing on the given collection of tracks.
    pub fn is_playing (&self, tracks: &[Track]) -> bool {
        self.clips.iter().any(|clip|clip.is_some()) && self.clips.iter().enumerate()
            .all(|(track_index, clip)|match clip {
                Some(c) => tracks
                    .get(track_index)
                    .map(|track|{
                        if let Some((_, Some(clip))) = track.sequencer().play_clip() {
                            *clip.read().unwrap() == *c.read().unwrap()
                        } else {
                            false
                        }
                    })
                    .unwrap_or(false),
                None => true
            })
    }
    pub fn clip (&self, index: usize) -> Option<&Arc<RwLock<MidiClip>>> {
        match self.clips.get(index) { Some(Some(clip)) => Some(clip), _ => None }
    }
}
            //scene_scroll:   Fill::Y(Fixed::x(1, ScrollbarV {
                //offset: arrangement.scene_scroll,
                //length: h_scenes_area as usize,
                //total:  h_scenes      as usize,
            //})),
//take!(SceneCommand |state: Arrangement, iter|state.selected_scene().as_ref()
    //.map(|t|Take::take(t, iter)).transpose().map(|x|x.flatten()));